The S&P 500 rose 1.43 percent on Monday for its third straight gain and its best session in seven weeks, leaving the index 0.44 percent below last month’s all-time high and pushing it into positive territory for September with a 1.49 percent month-to-date advance. Deutsche Bank strategists framed the move as fresh optimism on the outlook, though the catalyst amounted to a familiar rotation into the same mega-cap names that have driven the year’s returns.

Tech leadership narrows further

The Nasdaq climbed 2.26 percent and the Magnificent 7 group surged 3.44 percent, both hitting record highs of their own. Meta jumped 11.43 percent on enthusiasm around its Muse AI agent, while AMD added 9.95 percent to become the latest chipmaker to breach a $1 trillion valuation. The concentration is striking: two stocks accounted for a disproportionate share of the index’s best day in nearly two months.

Europe and Asia follow the lead

European benchmarks rose in tandem, with the STOXX 600 up 1.02 percent, the DAX 1.07 percent higher and the CAC 40 gaining 0.92 percent. In Asia, the KOSPI led with a 0.69 percent advance while China’s CSI 300 added 0.51 percent, the Shanghai Composite 0.23 percent and the Hang Seng 0.33 percent. Australia’s S&P/ASX 200 edged up 0.29 percent. Japanese markets remain closed through Wednesday. US equity futures were little changed after the close.

The September script gets rewritten

September has a reputation as one of the weakest months for equities, yet the index has erased its early-month deficit and now sits within half a percentage point of its peak. That the turnaround coincided with a handful of AI-exposed names hitting fresh highs suggests the market’s confidence remains tethered to a very narrow thesis. Whether that thesis broadens or simply re-rates the same leaders will decide if the record high is retested this week or merely admired from a distance.